As with capital goods (tangible items such as buildings, machinery, and equipment produced and used in the production of other goods and services), the consumption of a durable good is spread over its life span, which tends to create demand for a series of maintenance services.
The event which is referred to as The Phoenix Lights comprised of a series of incidents, involving a number of different craft and orbs which took place during the evening of March 13th 1997.
Phoenix was a robotic spacecraft on a space exploration mission on Mars under the Mars Scout Program. The Phoenix lander descended on Mars on May 25, 2008. Mission scientists used instruments aboard the lander to search for environments suitable for microbial life on Mars, and to research the history of water there.